llvm dev - May 2020 - ld.lld: error: Invalid record

Hi,

I am using LTO and a compile pass to make changes to a target.
So far that compile pass worked fine on many larger code projects,
however on a specific large target something seems to get wrong and lld
is not very helpful in the output:

ld.lld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o
ld.lld: /tmp/jasper-73de9f.o
ld.lld: src/libjasper/.libs/libjasper.a
[lots more libraries]
ld.lld: error: Invalid record (Producer: 'LLVM11.0.0git' Reader:
'LLVM
11.0.0git')

How can I find out which LLVM-IR entry in /tmp/jasper-73de9f.o is
resulting in that problem?
Thank you!

Regards,
Marc

-- 
Marc Heuse
www.mh-sec.de

PGP: AF3D 1D4C D810 F0BB 977D  3807 C7EE D0A0 6BE9 F573

On 2020-05-22, Marc via llvm-dev wrote:
>Hi,
>
>I am using LTO and a compile pass to make changes to a target.
>So far that compile pass worked fine on many larger code projects,
>however on a specific large target something seems to get wrong and lld
>is not very helpful in the output:
>
>ld.lld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o
>ld.lld: /tmp/jasper-73de9f.o
>ld.lld: src/libjasper/.libs/libjasper.a
>[lots more libraries]
>ld.lld: error: Invalid record (Producer: 'LLVM11.0.0git' Reader:
'LLVM
>11.0.0git')
>
>How can I find out which LLVM-IR entry in /tmp/jasper-73de9f.o is
>resulting in that problem?
>Thank you!
>
>Regards,
>Marc
The diagnostic may come from one of 224 instances of
`return error("Invalid record")` in
lib/Bitcode/Reader/{BitcodeReader,MetadataLoader}.cpp
I think you need a -DCMAKE_BUILD_TYPE=Build build and locate the exact
place by setting a breakpoing on BitcodeReaderBase::error